Mechanistic Insights into Potassium-Conferred Drought Stress Tolerance in Cultivated and Tibetan Wild Barley: Differential Osmoregulation, Nutrient Retention, Secondary Metabolism and Antioxidative Defense Capacity.
Mechanistic Insights into Potassium-Conferred Drought Stress Tolerance in Cultivated and Tibetan Wild Barley: Differential Osmoregulation, Nutrient Retention, Secondary Metabolism and Antioxidative Defense Capacity.
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钾赋予栽培大麦和西藏野生大麦的干旱胁迫耐受性的机制见解：差异渗透调节、养分保留、次生代谢和抗氧化防御能力
DOI：
10.3390/ijms222313100
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发表时间：
2021-12-03
影响因子：
5.6
通讯作者：
Wang Y
中科院分区：
文献类型：
--
作者：
Sehar S;Adil MF;Zeeshan M;Holford P;Cao F;Wu F;Wang Y
本研究着眼于钾营养的重要性，研究了两个野生大麦品种(耐旱品种XZ5和耐旱品种XZ54)和一个耐旱大麦新品系的遗传效应。泰德摩尔，暴露在聚乙二醇诱导的干旱胁迫下。结果表明，干旱和缺钾对所有供试品种的植株整体生长都有一定的抑制作用，但XZ5对植株生长的影响最小，这主要是由于XZ5具有较强的组织保钾能力，这主要归因于各处理的光合作用参数、相对叶绿素含量和Na+/K+比值的下降幅度最小。我们的结果还表明，与Tadeor和XZ54相比，更高的H+/K+-ATPase活性(地上部分别提高1.6和1.3倍；根分别提高1.4和2.5倍)，更高的地上部K+(2和2.3倍)和更高的钙含量(1.5和1.7倍)，通过渗透压积累更好地维持膨压，增强抗氧化能力以清除ROS，最终抑制膜脂过氧化(地上部：4%和35%；根：4%和20%)，并赋予XZ5更高的抗旱性。综上所述，本研究提供了进一步的证据支持这一观点，即有效利用钾的西藏野生大麦基因型可以作为一个有价值的遗传资源，除了提供抗旱基因外，还可以提供改善钾代谢的基因，从而使培育出更耐非生物胁迫的优良大麦品系成为可能。
Keeping the significance of potassium (K) nutrition in focus, this study explores the genotypic responses of two wild Tibetan barley genotypes (drought tolerant XZ5 and drought sensitive XZ54) and one drought tolerant barley cv. Tadmor, under the exposure of polyethylene glycol-induced drought stress. The results revealed that drought and K deprivation attenuated overall plant growth in all the tested genotypes; however, XZ5 was least affected due to its ability to retain K in its tissues which could be attributed to the smallest reductions of photosynthetic parameters, relative chlorophyll contents and the lowest Na+/K+ ratios in all treatments. Our results also indicate that higher H+/K+-ATPase activity (enhancement of 1.6 and 1.3-fold for shoot; 1.4 and 2.5-fold for root), higher shoot K+ (2 and 2.3-fold) and Ca2+ content (1.5 and 1.7-fold), better maintenance of turgor pressure by osmolyte accumulation and enhanced antioxidative performance to scavenge ROS, ultimately suppress lipid peroxidation (in shoots: 4% and 35%; in roots 4% and 20% less) and bestow higher tolerance to XZ5 against drought stress in comparison with Tadmor and XZ54, respectively. Conclusively, this study adds further evidence to support the concept that Tibetan wild barley genotypes that utilize K efficiently could serve as a valuable genetic resource for the provision of genes for improved K metabolism in addition to those for combating drought stress, thereby enabling the development of elite barley lines better tolerant of abiotic stresses.
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影响因子：
0.5
作者：
Nedukha, O. M.
通讯作者：
Nedukha, O. M.
影响因子：
11.8
作者：
Li S;Yamada M;Han X;Ohler U;Benfey PN
通讯作者：
Benfey PN
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影响因子：
3.7
作者：
Ahmed I;Greenwood R;Costello Bde L;Ratcliffe NM;Probert CS
通讯作者：
Probert CS
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DOI：
10.1073/pnas.1414335111
发表时间：
2014-09-16
影响因子：
11.1
作者：
Dai, Fei;Chen, Zhong-Hua;Zhang, Guoping
通讯作者：
Zhang, Guoping
影响因子：
4.3
作者：
Chen, Fei;Wu, Feibo;Wei, Kang
通讯作者：
Wei, Kang